19.12 GET_COUNT Function

This function returns the number of array elements or object members.

Syntax

APEX_JSON.GET_COUNT (
    p_path             IN VARCHAR2,
    p0                 IN VARCHAR2 DEFAULT NULL,
    p1                 IN VARCHAR2 DEFAULT NULL,
    p2                 IN VARCHAR2 DEFAULT NULL,
    p3                 IN VARCHAR2 DEFAULT NULL,
    p4                 IN VARCHAR2 DEFAULT NULL,
    p_values           IN t_values DEFAULT g_values )
RETURN NUMBER;

Parameters

Table 19-7 GET_COUNT Function Parameters

Parameter	Description
`p_path`	Index into `p_values`.
`p[0-4]`	Each %N in `p_path` is replaced by `pN` and every i-th %s or %d is replaced by the `p[i-1]`.
`p_values`	Parsed JSON members. The default is `g_values`.

Returns/Raised Errors

Table 19-8 GET_COUNT Function Returns and Raised Errors

Return	Description
`NUMBER`	The number of array elements or object members or null if the array or object could not be found
`VALUE_ERROR`	Raises this error if `p_values(p_path)` is not an array or object.

Example

This example parses a JSON string and prints the number of members at positions.

DECLARE 
    j apex_json.t_values; 
BEGIN 
    apex_json.parse(j, '{ "foo": 3, "bar": [1, 2, 3, 4] }'); 
    dbms_output.put_line(apex_json.get_count(p_path=>'.',p_values=>j)); -- 2 (foo and bar) 
    dbms_output.put_line(apex_json.get_count(p_path=>'bar',p_values=>j)); -- 4 
END;

Parent topic: APEX_JSON